The amount of this to be added depends upon the percentage of saponifier used.
The fatty acids obtained by the Twitchell saponifier may be converted into soap by carbonates, thus saving cost in alkali.
The saponifier is then added through a glass or granite ware funnel after the contents of the tank have been brought to a boil.
saponify sa·pon·i·fy (sə-pŏn'ə-fī')
v. sa·pon·i·fied, sa·pon·i·fy·ing, sa·pon·i·fies
To undergo saponification.